First, in order to support the empirical mass formula discussed in this paper for fundamental fermions, our previous work on an ``intrinsic interpretation'' of lepton and quark generations is summarized. In this framework, some intrinsic dynamical factors are proposed as responsible for the structure of fundamental-fermion empirical mass formula. Then, a satisfactory mass sum rule for charged leptons is derived, predicting perfectly the (actual) experimental central value 1776.99 MeV of m\tau , when the input of experimental values of me and m\mu is applied. The derivation goes through identifying in the structure of three-parameter empirical mass formula for charged leptons a tiny combination of parameters which, if postulated to be exactly zero, gives a parameter constraint leading to the satisfactory mass sum rule.
PACS numbers: 12.15.Ff, 12.90.+b
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